I have a custom site template wsp file & workflow wsp file.
I am trying to combine these two wsp file to one.
Is that possible to do this in office 365 with sandbox solution, and if so, how?
It is possible, you'll have to replicate steps that Visual Studio automagically do for you ).
.cabarchive, you'll need a tool to deal with
cabs. I used
Total Commanderplugin for the purpose. Extract into separate folders.
manifest.xmlfrom those folders into one
.cabfile using tool
That is pretty easy unless you have files with the same name in both archives